kernel/linux.git/drivers/tty/vt/vt.c, branch linux-4.20.y

vt: invoke notifier on screen size change

2019-01-31T07:15:44+00:00

commit 0c9b1965faddad7534b6974b5b36c4ad37998f8e upstream. User space using poll() on /dev/vcs devices are not awaken when a screen size change occurs. Let's fix that. Signed-off-by: Nicolas Pitre Cc: stable Signed-off-by: Greg Kroah-Hartman

vt: always call notifier with the console lock held

2019-01-31T07:15:43+00:00

commit 7e1d226345f89ad5d0216a9092c81386c89b4983 upstream. Every invocation of notify_write() and notify_update() is performed under the console lock, except for one case. Let's fix that. Signed-off-by: Nicolas Pitre Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

vt: make vt_console_print() compatible with the unicode screen buffer

2019-01-31T07:15:43+00:00

commit 6609cff65c5b184ab889880ef5d41189611ea05f upstream. When kernel messages are printed to the console, they appear blank on the unicode screen. This is because vt_console_print() is lacking a call to vc_uniscr_putc(). However the later function assumes vc->vc_x is always up to date when called, which is not the case here as vt_console_print() uses it to mark the beginning of the display update. This patch reworks (and simplifies) vt_console_print() so that vc->vc_x is always valid and keeps the start of display update in a local variable instead, which finally allows for adding the missing vc_uniscr_putc() call. Signed-off-by: Nicolas Pitre Cc: stable@vger.kernel.org # v4.19+ Signed-off-by: Greg Kroah-Hartman

Merge tag 'tty-4.20-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

2018-11-10T19:32:14+00:00

Pull tty/serial fixes from Greg KH: "Here are some small tty fixes for 4.20-rc2 One of these missed the original 4.19-final release, I missed that I hadn't done a pull request for it as it was in linux-next and my branch for a long time, that's my fault. The others are small, fixing some reported issues and finally fixing the termios mess for alpha so that glibc has a chance to implement some missing functionality that has been pending for many years now. All of these have been in linux-next with no reported issues" * tag 'tty-4.20-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: serial: sh-sci: Fix could not remove dev_attr_rx_fifo_timeout arch/alpha, termios: implement BOTHER, IBSHIFT and termios2 termios, tty/tty_baudrate.c: fix buffer overrun vt: fix broken display when running aptitude serial: sh-sci: Fix receive on SCIFA/SCIFB variants with DMA

vt: fix broken display when running aptitude

2018-11-08T11:36:40+00:00

If you run aptitude on framebuffer console, the display is corrupted. The corruption is caused by the commit d8ae7242. The patch adds "offset" to "start" when calling scr_memsetw, but it forgets to do the same addition on a subsequent call to do_update_region. Signed-off-by: Mikulas Patocka Fixes: d8ae72427187 ("vt: preserve unicode values corresponding to screen characters") Reviewed-by: Nicolas Pitre Cc: stable@vger.kernel.org # 4.19 Signed-off-by: Greg Kroah-Hartman

vt: Remove vc_panic_force_write

2018-09-11T12:11:51+00:00

It was only used by the panic support in fbcon, which is now gone. Remove this now dead code too. Acked-by: Greg Kroah-Hartman Cc: Greg Kroah-Hartman Cc: Kees Cook Cc: Joe Perches Cc: Daniel Vetter Cc: Meng Xu Cc: Nicolas Pitre Cc: Thomas Meyer Cc: Mike Frysinger Cc: Bartlomiej Zolnierkiewicz Cc: Hans de Goede Cc: Thierry Reding Cc: David Lechner Cc: Philippe Ombredanne Cc: Thomas Gleixner Cc: Kate Stewart Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20180822085405.10787-2-daniel.vetter@ffwll.ch

vt: avoid a VLA in the unicode screen scroll function

2018-07-21T07:19:46+00:00

The nr argument is typically small: most often nr == 1. However this could be abused with a very large explicit scroll in a resized screen. Make the code scroll lines by performing an array rotation operation to avoid the need for a large temporary space. Requested-by: Kees Cook Suggested-by: Adam Borowski Signed-off-by: Nicolas Pitre Signed-off-by: Greg Kroah-Hartman

vt: coherence validation code for the unicode screen buffer

2018-07-21T07:18:27+00:00

Make sure the unicode screen buffer matches the video screen content. This is provided for debugging convenience and disabled by default. Signed-off-by: Nicolas Pitre Signed-off-by: Greg Kroah-Hartman

vt: selection: take screen contents from uniscr if available

2018-07-21T07:18:27+00:00

This preserves whatever was written even if we can't currently display the given glyph. Mouse paste won't corrupt any character of wcwidth() == 1 anymore. Note that for now uniscr doesn't get allocated until something reads /dev/vcsuN for that console, making this code dormant for most users. Signed-off-by: Adam Borowski Acked-by: Nicolas Pitre Signed-off-by: Greg Kroah-Hartman

Merge 4.18-rc3 into tty-next

2018-07-02T06:23:43+00:00

We want ths tty core changes in here as well. Signed-off-by: Greg Kroah-Hartman